全文获取类型
收费全文 | 7797篇 |
免费 | 543篇 |
国内免费 | 51篇 |
专业分类
耳鼻咽喉 | 49篇 |
儿科学 | 310篇 |
妇产科学 | 132篇 |
基础医学 | 955篇 |
口腔科学 | 91篇 |
临床医学 | 744篇 |
内科学 | 1636篇 |
皮肤病学 | 103篇 |
神经病学 | 808篇 |
特种医学 | 352篇 |
外科学 | 1234篇 |
综合类 | 35篇 |
预防医学 | 532篇 |
眼科学 | 119篇 |
药学 | 572篇 |
中国医学 | 14篇 |
肿瘤学 | 705篇 |
出版年
2024年 | 14篇 |
2023年 | 95篇 |
2022年 | 127篇 |
2021年 | 199篇 |
2020年 | 171篇 |
2019年 | 213篇 |
2018年 | 266篇 |
2017年 | 234篇 |
2016年 | 217篇 |
2015年 | 262篇 |
2014年 | 333篇 |
2013年 | 429篇 |
2012年 | 615篇 |
2011年 | 622篇 |
2010年 | 320篇 |
2009年 | 291篇 |
2008年 | 495篇 |
2007年 | 501篇 |
2006年 | 510篇 |
2005年 | 417篇 |
2004年 | 414篇 |
2003年 | 380篇 |
2002年 | 372篇 |
2001年 | 53篇 |
2000年 | 39篇 |
1999年 | 61篇 |
1998年 | 75篇 |
1997年 | 58篇 |
1996年 | 58篇 |
1995年 | 50篇 |
1994年 | 40篇 |
1993年 | 45篇 |
1992年 | 37篇 |
1991年 | 33篇 |
1990年 | 27篇 |
1989年 | 29篇 |
1988年 | 23篇 |
1987年 | 29篇 |
1986年 | 22篇 |
1985年 | 20篇 |
1984年 | 14篇 |
1983年 | 32篇 |
1982年 | 18篇 |
1981年 | 21篇 |
1980年 | 11篇 |
1979年 | 12篇 |
1978年 | 8篇 |
1977年 | 8篇 |
1975年 | 10篇 |
1967年 | 7篇 |
排序方式: 共有8391条查询结果,搜索用时 15 毫秒
11.
12.
Helen Elden Hans-Christian Ostgaard Monika Fagevik-Olsen Lars Ladfors Henrik Hagberg 《BMC complementary and alternative medicine》2008,8(1):34
Background
Previous publications indicate that acupuncture is efficient for the treatment of pelvic girdle pain, PGP, in pregnant women. However, the use of acupuncture for PGP is rare due to insufficient documentation of adverse effects of this treatment in this specific condition. The aim of the present work was to assess adverse effects of acupuncture on the pregnancy, mother, delivery and the fetus/neonate in comparison with women that received stabilising exercises as adjunct to standard treatment or standard treatment alone. 相似文献13.
An IFN-beta-albumin fusion protein that displays improved pharmacokinetic and pharmacodynamic properties in nonhuman primates. 总被引:6,自引:0,他引:6
Cynthia Sung Bernardetta Nardelli David W LaFleur Erich Blatter Marta Corcoran Henrik S Olsen Charles E Birse Oxana K Pickeral Junli Zhang Devanshi Shah Gordon Moody Solange Gentz Lisa Beebe Paul A Moore 《Journal of interferon & cytokine research》2003,23(1):25-36
The long half-life and stability of human serum albumin (HSA) make it an attractive candidate for fusion to short-lived therapeutic proteins. Albuferon (Human Genome Sciences [HGS], Inc., Rockville, MD) beta is a novel recombinant protein derived from a gene fusion of interferon-beta (IFN-beta ) and HSA. In vitro, Albuferon beta displays antiviral and antiproliferative activities and triggers the IFN-stimulated response element (ISRE) signal transduction pathway. Array analysis of 5694 independent genes in Daudi-treated cells revealed that Albuferon beta and IFN-beta induce the expression of an identical set of 30 genes, including 9 previously not identified. In rhesus monkeys administered a dose of 50 microg/kg intravenously (i.v.) or subcutaneously (s.c.) or 300 microg/kg s.c., Albuferon beta demonstrated favorable pharmacokinetic properties. Subcutaneous bioavailability was 87%, plasma clearance at 4.7-5.7 ml/h/kg was approximately 140-fold lower than that of IFN-beta, and the terminal half-life was 36-40 h compared with 8 h for IFN-beta. Importantly, Albuferon beta induced sustained increases in serum neopterin levels and 2',5' mRNA expression. At a molar dose equivalent to one-half the dose of IFN-beta, Albuferon beta elicited comparable neopterin responses and significantly higher 2',5'-OAS mRNA levels in rhesus monkeys. The enhanced in vivo pharmacologic properties of IFN-beta when fused to serum albumin suggest a clinical opportunity for improved IFN-beta therapy. 相似文献
14.
Helin H Lundin M Lundin J Martikainen P Tammela T Helin H van der Kwast T Isola J 《Human pathology》2005,36(4):381-386
Gleason grading forms the basis of prognostic and therapeutic assessment in prostatic carcinoma despite its subjective nature and substantial interobserver variation. The accuracy of Gleason grading can be improved by the use of educational tools such as reference images. However, conventional microscopy images are of limited educational value because it is neither possible to view the sample at different magnifications nor to navigate into different areas of the specimen. This limitation can be overcome by the use of virtual microscopy, which allows viewing entire digitized microscope slides. We created an interactive Web site ( www.webmicroscope.net/gleason ) featuring a comprehensive set of prostatic needle biopsies as virtual slides, which can be viewed with a standard Web browser (Internet Explorer or Netscape). To evaluate the validity of Web-based virtual microscopy for Gleason grading, an experienced uropathologist (TK) scored a series of 62 biopsies from the original glass slides and 6 weeks later from virtual slides on the Web site using an ordinary desktop computer. The intraobserver agreement was excellent, with identical Gleason scores found in 48 of the 62 cases ( kappa = 0.73). The 14 remaining scores differed only by 1 point on the Gleason scale (2-10). The virtual slides were viewed by 2 other uropathologists (PM and HH), with interobserver kappa coefficients ranging from 0.55 to 0.62, which is within the range of previously reported studies using glass slides. The 3 uropathologists' Gleason scores were included as reference scores on the Web site, which now serves as a publicly open platform for self-testing and learning of Gleason grading. We conclude that Web-based virtual microscopy is a promising new tool for teaching and standardizing Gleason grading. 相似文献
15.
16.
IgE Anti-IgG Antibodies in Patients with Juvenile and Adult Rheumatoid Arthritis Including Felty's Syndrome 总被引:1,自引:0,他引:1
Anti-IgG; antihodies (anti-IgG) of the IgE class were studied in sera from patients with juvenile rheumatoid arthritis (JRA). rheumatoid arthritis (RA) and patients with Felty's syndrome (FS) by use of an indirect immunofluorescence technique. Forty-two percent of 26 patients with JRA had IgE anti-IgG in serum all in low titers. Positive reactions prevailed in patients with multiple joint involvement. Sixty-three percent of 30 patients with RA and 80% of 20 patients with FS had IgE anti-IgG, the titers found in FS patients being significantly higher. In JRA and FS patients the IgE anti-IgG titers were correlated to the titers of anti-IgG of the IgG class, and for FS patients also with the IgM and IgA classes of anti-IgG. In six of 10 patients with RA the synovial fluid samples from both knees contained IgE anti-IgG. In four of these patients the titers of IgE anti-IgG were higher than in the corresponding serum sample, pointing to a local production. After G-200 Sephadex chromatography IgE anti-IgG were demonstrated in the void volume indicating the presence of these autoantibodies in immune complexes. IgE anti-IgG may be involved in the pathogenesis of JRA and RA by eliciting Type I and III reactions. 相似文献
17.
18.
Grasp stability during object manipulation is achieved by the grip forces applied normal to the grasped surfaces increasing and decreasing in phase with increases and decreases of destabilizing load forces applied tangential to the grasped surfaces. This force coordination requires that the CNS anticipates the grip forces that match the requirements imposed by the self-generated load forces. Here, we use functional MRI (fMRI) to study neural correlates of the grip-load force coordination in a grip-load force task in which six healthy humans attempted to lift an immovable test object held between the tips of the right index finger and thumb. The recorded brain activity was compared with the brain activity obtained in two control tasks in which the same pair of digits generated forces with similar time courses and magnitudes; i.e., a grip force task where the subjects only pinched the object and did not apply load forces, and a load force task, in which the subjects applied vertical forces to the object without generating grip forces. Thus neither the load force task nor the grip force task involved coordinated grip-load forces, but together they involved the same grip force and load force output. We found that the grip-load force task was specifically associated with activation of a section of the right intraparietal cortex, which is the first evidence for involvement of the posterior parietal cortex in the sensorimotor control of coordinated grip and load forces in manipulation. We suggest that this area might represents a node in the network of cortical and subcortical regions that implement anticipatory control of fingertip forces for grasp stability. 相似文献
19.
20.